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in part because of the associated stigma and because it is not a notifiable disease in most countries&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">3</span></a> Nonetheless&#44; the number of scabies cases diagnosed in Spain has been on the rise since 2014&#44; with some studies suggesting a recent explosion<a class="elsevierStyleCrossRefs" href="#bib0100"><span class="elsevierStyleSup">4&#44;5</span></a> and similar reports from other European countries&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">6&#8211;8</span></a> Because&#44; however&#44; there are no epidemiological surveillance programs for scabies in Spain&#44; the true magnitude of the epidemic in our country is unknown&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">One way of tracking changes to the incidence of diseases not covered by traditional epidemiologic surveillance systems in the public health field is to analyze drug sales data&#46; Another potentially useful method for indirectly estimating certain epidemiologic characteristics of many health conditions&#44; including skin infestations&#44; is to analyze public interest via internet search trends in a given country or region over time&#46;<a class="elsevierStyleCrossRefs" href="#bib0125"><span class="elsevierStyleSup">9&#8211;11</span></a> Google Trends is a free tool that can be used to analyze changes in the popularity of Google search terms applied to specific time periods and places&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">12</span></a> The tool uses a measure called relative search volume &#40;RSV&#41;&#44; which has a scale of 0 to 100&#44; where 100 indicates the highest percentage of searches for a term in a given place and time&#46; An RSV of 0 does not necessarily mean that no searches were conducted&#59; it simply indicates low interest relative to terms with a peak RSV &#40;RSV<span class="elsevierStyleInf">max</span>&#41;&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Google Trends offers several advantages&#44; including a free&#44; simple&#44; and fast tool for analyzing real-time changes in a large database and comparing searches across topics&#44; periods&#44; and geographic areas&#46; It also has its limitations&#46; Notably&#44; people older than 65 years use the internet less&#44; the data provided are relative&#44; and it is not possible to stratify by age&#44; sex&#44; or other variables of interest&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">The aim of this study was to complement existing evidence on the increasing number of scabies cases in our country by analyzing changes in ectoparasiticide prescriptions and internet searches for scabies infestations measured by Google Trends&#46; We also examined correlations between these 2 variables&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Material and Methods</span><p id="par0030" class="elsevierStylePara elsevierViewall">We conducted a targeted search of ectoparasiticide sales &#40;code P03A&#41; on the Spanish Ministry of Health website<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">13</span></a> and collected annual data for the years 2009 to 2021 and monthly data from January 2020 to February 2022&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">We also examined Google search volumes for terms relating to scabies in Spain for the period January 2004 to June 2022&#46; The terms used were <span class="elsevierStyleItalic">sarna</span> and <span class="elsevierStyleItalic">escabiosis</span> &#40;Spanish terms for scabies&#41;&#44; and <span class="elsevierStyleItalic">escabiosi</span> &#40;the Catalan term&#41;&#46; Terms such as <span class="elsevierStyleItalic">itch</span>&#44; <span class="elsevierStyleItalic">pruritus</span>&#44; and <span class="elsevierStyleItalic">treatment resistance</span> were excluded as they were considered nonspecific&#46; The Google Trends search was conducted on June 27&#44; 2022&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Statistical analyses were conducted in the software program StatPlus&#46; For the descriptive analysis&#44; mean and standard error of the mean &#40;SEM&#41; were used as measures of central tendency and dispersion&#44; respectively&#46; Correlations between variables were studied using linear correlation analysis&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Results</span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Changes in Ectoparasiticide Sales in Spain</span><p id="par0045" class="elsevierStylePara elsevierViewall">The data obtained from the Spanish Ministry of Health showed an uninterrupted growth in the sale of ectoparasiticides with a medical prescription since 2014&#44; with a minimum interannual increase of 15&#46;22&#37; &#40;2014-2015&#41; and a maximum interannual increase of 61&#46;92&#37; &#40;2020-2021&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The monthly data &#40;January 2020 to February 2022&#41; also show a growing trend&#44; with higher sales in winter months &#40;December to March&#44; mean &#91;SEM&#93;&#44; 29&#160;580 &#91;3820&#93;&#41; than summer months &#40;June to September&#44; mean &#91;SEM&#93; 17&#160;510 &#91;1960&#93;&#41;&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The record observed for pharmacy sales of ectoparasiticides was in February 2022&#44; with a total of 50&#160;250 packages sold&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Changes in Public Interest According to Google Trends</span><p id="par0060" class="elsevierStylePara elsevierViewall">The RSV for scabies in Spain has followed a rising trend since 2004 &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#44; with volumes reaching their minimum &#40;RSV<span class="elsevierStyleInf">min</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>7&#41; in May 2004 and December 2007 and their maximum &#40;RSV<span class="elsevierStyleInf">max</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>100&#41; in February 2022&#46; Mean RSV was higher in winter &#40;December to March&#41; than summer &#40;June to September&#41;&#44; with respective rates of 21&#46;04 &#40;1&#46;85&#41; and 17&#46;76 &#40;0&#46;84&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall">A strong&#44; positive correlation was observed between monthly ectoparasiticide sales data in base 100 with the Google Trends RSV for scabies in Spain &#40;Pearson correlation coefficient&#44; r<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;81&#59; <span class="elsevierStyleItalic">P</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>&#46;001&#41;&#46; Peak popularity in Google search volumes &#40;RSV<span class="elsevierStyleInf">max</span>&#41; concurred with the record ectoparasiticide sales noted for February 2022 &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; This point was followed by a sharp reduction in searches&#44; which reached an RSV of 35 on June 19&#44; 2022&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Discussion</span><p id="par0070" class="elsevierStylePara elsevierViewall">We observed an explosion in pharmacy sales of ectoparasiticides in Spain between 2020 and 2021&#46; The number of packages sold does not reflect the number of patients treated&#44; making it impossible to distinguish between increases due to a rise in patients or a rise in prescriptions per patient &#40;e&#46;g&#46;&#44; prescriptions for the whole family or repeat treatments&#41;&#46; We assume that the changes observed are more indicative of an increase in scabies than in other ectoparasitic infections&#44; as the latter are much less common in Spain&#46; This &#8220;large-scale national outbreak&#8221; has been attributed to COVID-19 lockdown measures and possible resistance to conventional treatments&#46;<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">14&#44;15</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">Google searches for terms related to scabies have also shown a rising trend since 2004&#44; with a notable increase observed since the end of 2012&#46; Internet search volumes are a good indicator of public interest in a given topic&#44; but they do not necessarily correlate with epidemiological phenomena&#46; Many factors can drive public interest in a topic&#44; including media coverage&#44; commercial or advertising interests&#44; novelty&#44; and topics with a temporary or periodic nature&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">Our data for Spain show that monthly ectoparasiticide sales were strongly and positively correlated with Google searches for scabies during the same period&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Sales and internet search volumes were also higher in winter than summer months&#44; although the difference did not reach statistical significance&#46; Infestations would be expected to be more prevalent in winter&#44; as mites are able to survive for longer outside the host in humid&#44; cold conditions&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">1&#44;16</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">We observed a sharp drop in RSV following the peak in February 2022&#44; but were unable to compare this to ectoparasiticide sales for the same period as the data had not been published at the time of writing&#46; Perhaps the drop in search volume will ultimately be reflected in a drop in scabies cases&#44; and with it&#44; a drop in ectoparasiticide sales&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Conclusions</span><p id="par0095" class="elsevierStylePara elsevierViewall">Public interest in scabies and ectoparasiticide sales in Spain have increased in recent years and show a strong&#44; positive correlation&#46; Despite its limitations&#44; Google Trends could be considered as a complementary tool for monitoring real-time trends in scabies infestations in Spain&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Conflicts of Interest</span><p id="par0100" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Scabies is an ectoparasitic dermatosis caused by the <span class="elsevierStyleItalic">Sarcoptes scabiei</span> var&#46; <span class="elsevierStyleItalic">hominis</span> mite&#44; which lives and reproduces in humans&#46; Its incidence in Spain has increased in recent years&#46; The aim of this study was to complement existing evidence on the increasing number of scabies cases in our country by analyzing changes in ectoparasiticide prescriptions and Internet searches for scabies infestations measured by Google Trends&#46; We also examined correlations between these two variables&#46; Our results show that public interest in scabies has increased in recent years and is positively and significantly correlated with an increasing use of ectoparasiticides&#46; We believe that Google Trends should be considered as a complementary tool for monitoring real-time trends in scabies infestations in Spain&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">La escabiosis es una dermatosis ectoparasitaria causada por <span class="elsevierStyleItalic">Sarcoptes scabiei</span> var&#46; <span class="elsevierStyleItalic">hominis</span> y cuyo reservorio son los humanos&#46; En los &#250;ltimos a&#241;os se ha visto un incremento de los casos de escabiosis en nuestro pa&#237;s&#46; El objetivo de este trabajo es complementar la evidencia existente sobre el aumento de la escabiosis en Espa&#241;a mediante el estudio de la evoluci&#243;n del consumo de medicamentos ectoparasiticidas y el an&#225;lisis temporal en Google Trends de las b&#250;squedas en internet relacionadas con la infestaci&#243;n&#44; as&#237; como explorar la relaci&#243;n entre ambos fen&#243;menos&#46; Nuestro estudio demuestra un incremento del inter&#233;s p&#250;blico en la escabiosis y del consumo de ectoparasiticidas en los &#250;ltimos a&#241;os en Espa&#241;a&#44; existiendo una correlaci&#243;n positiva y significativa entre ambos fen&#243;menos&#46; Proponemos Google Trends como una herramienta complementaria a tener en cuenta a la hora de monitorizar en tiempo real el comportamiento de esta infestaci&#243;n en nuestro pa&#237;s&#46;</p></span>"
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Changes in Google searches for scabies in Spain from 2004 to 2022&#46;</p> <p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Source&#58; graph created using Google Trends data&#46;</p>"
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                      "titulo" => "Scabies&#58; A neglected global disease"
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                      "titulo" => "Estimating the global burden of scabies&#58; What else do we need&#63;"
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Vol. 115. Núm. 1.
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Vol. 115. Núm. 1.
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Brief Communication
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Scabies in Spain: Trends in Public Interest and Ectoparasiticide Use
Escabiosis en España: tendencias del interés público y consumo de ectoparasiticidas
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Á. Fernández Camporroa,b,
Autor para correspondencia
angelderma95@gmail.com

Corresponding author.
, Í. Navarro Fernándeza, P. Arcos Gonzálezb
a Servicio de Dermatología, Hospital Universitario de Cabueñes, Gijón, Asturias, Spain
b Departamento de Medicina, Universidad de Oviedo, Oviedo, Spain
Contenido relacionado
Actas Dermosifiliogr. 2024;115:76-910.1016/j.ad.2022.11.018
Á. Fernández Camporro, Í. Navarro Fernández, P. Arcos González
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Abstract

Scabies is an ectoparasitic dermatosis caused by the Sarcoptes scabiei var. hominis mite, which lives and reproduces in humans. Its incidence in Spain has increased in recent years. The aim of this study was to complement existing evidence on the increasing number of scabies cases in our country by analyzing changes in ectoparasiticide prescriptions and Internet searches for scabies infestations measured by Google Trends. We also examined correlations between these two variables. Our results show that public interest in scabies has increased in recent years and is positively and significantly correlated with an increasing use of ectoparasiticides. We believe that Google Trends should be considered as a complementary tool for monitoring real-time trends in scabies infestations in Spain.

Keywords:
Scabies
Mites
Epidemiology
Infodemiology
Google Trends
Public interest
Resumen

La escabiosis es una dermatosis ectoparasitaria causada por Sarcoptes scabiei var. hominis y cuyo reservorio son los humanos. En los últimos años se ha visto un incremento de los casos de escabiosis en nuestro país. El objetivo de este trabajo es complementar la evidencia existente sobre el aumento de la escabiosis en España mediante el estudio de la evolución del consumo de medicamentos ectoparasiticidas y el análisis temporal en Google Trends de las búsquedas en internet relacionadas con la infestación, así como explorar la relación entre ambos fenómenos. Nuestro estudio demuestra un incremento del interés público en la escabiosis y del consumo de ectoparasiticidas en los últimos años en España, existiendo una correlación positiva y significativa entre ambos fenómenos. Proponemos Google Trends como una herramienta complementaria a tener en cuenta a la hora de monitorizar en tiempo real el comportamiento de esta infestación en nuestro país.

Palabras clave:
Escabiosis
Sarna
Epidemiología
Infodemiología
Google Trends
Interés público
Texto completo
Introduction

Scabies, which is classified as a neglected tropical disease by the World Health Organization, is an ectoparasitic dermatosis caused by the Sarcoptes scabiei var. hominis mite, which lives and reproduces in humans.1 Although in the past, scabies was typically associated with situations of poverty, poor hygiene, and overcrowding due to wars, forced displacement, and economic crises, it is currently endemic in many developing countries, and epidemiologically, it can now be considered a broadly global disease.2

It is difficult to estimate the global prevalence and impact of scabies, in part because of the associated stigma and because it is not a notifiable disease in most countries.3 Nonetheless, the number of scabies cases diagnosed in Spain has been on the rise since 2014, with some studies suggesting a recent explosion4,5 and similar reports from other European countries.6–8 Because, however, there are no epidemiological surveillance programs for scabies in Spain, the true magnitude of the epidemic in our country is unknown.

One way of tracking changes to the incidence of diseases not covered by traditional epidemiologic surveillance systems in the public health field is to analyze drug sales data. Another potentially useful method for indirectly estimating certain epidemiologic characteristics of many health conditions, including skin infestations, is to analyze public interest via internet search trends in a given country or region over time.9–11 Google Trends is a free tool that can be used to analyze changes in the popularity of Google search terms applied to specific time periods and places.12 The tool uses a measure called relative search volume (RSV), which has a scale of 0 to 100, where 100 indicates the highest percentage of searches for a term in a given place and time. An RSV of 0 does not necessarily mean that no searches were conducted; it simply indicates low interest relative to terms with a peak RSV (RSVmax).

Google Trends offers several advantages, including a free, simple, and fast tool for analyzing real-time changes in a large database and comparing searches across topics, periods, and geographic areas. It also has its limitations. Notably, people older than 65 years use the internet less, the data provided are relative, and it is not possible to stratify by age, sex, or other variables of interest.

The aim of this study was to complement existing evidence on the increasing number of scabies cases in our country by analyzing changes in ectoparasiticide prescriptions and internet searches for scabies infestations measured by Google Trends. We also examined correlations between these 2 variables.

Material and Methods

We conducted a targeted search of ectoparasiticide sales (code P03A) on the Spanish Ministry of Health website13 and collected annual data for the years 2009 to 2021 and monthly data from January 2020 to February 2022.

We also examined Google search volumes for terms relating to scabies in Spain for the period January 2004 to June 2022. The terms used were sarna and escabiosis (Spanish terms for scabies), and escabiosi (the Catalan term). Terms such as itch, pruritus, and treatment resistance were excluded as they were considered nonspecific. The Google Trends search was conducted on June 27, 2022.

Statistical analyses were conducted in the software program StatPlus. For the descriptive analysis, mean and standard error of the mean (SEM) were used as measures of central tendency and dispersion, respectively. Correlations between variables were studied using linear correlation analysis.

ResultsChanges in Ectoparasiticide Sales in Spain

The data obtained from the Spanish Ministry of Health showed an uninterrupted growth in the sale of ectoparasiticides with a medical prescription since 2014, with a minimum interannual increase of 15.22% (2014-2015) and a maximum interannual increase of 61.92% (2020-2021).

The monthly data (January 2020 to February 2022) also show a growing trend, with higher sales in winter months (December to March, mean [SEM], 29 580 [3820]) than summer months (June to September, mean [SEM] 17 510 [1960]).

The record observed for pharmacy sales of ectoparasiticides was in February 2022, with a total of 50 250 packages sold.

Changes in Public Interest According to Google Trends

The RSV for scabies in Spain has followed a rising trend since 2004 (Fig. 1), with volumes reaching their minimum (RSVmin=7) in May 2004 and December 2007 and their maximum (RSVmax=100) in February 2022. Mean RSV was higher in winter (December to March) than summer (June to September), with respective rates of 21.04 (1.85) and 17.76 (0.84).

Figure 1.

Changes in Google searches for scabies in Spain from 2004 to 2022.

Source: graph created using Google Trends data.

(0.19MB).

A strong, positive correlation was observed between monthly ectoparasiticide sales data in base 100 with the Google Trends RSV for scabies in Spain (Pearson correlation coefficient, r=0.81; P<.001). Peak popularity in Google search volumes (RSVmax) concurred with the record ectoparasiticide sales noted for February 2022 (Fig. 2). This point was followed by a sharp reduction in searches, which reached an RSV of 35 on June 19, 2022.

Figure 2.

Number of ectoparasiticide products (in base 100) sold in Spain (blue) vs. relative search volume for scabies in Google (yellow).

Source: graph created using data from the Spanish Ministry of Health and Google Trends.

(0.15MB).
Discussion

We observed an explosion in pharmacy sales of ectoparasiticides in Spain between 2020 and 2021. The number of packages sold does not reflect the number of patients treated, making it impossible to distinguish between increases due to a rise in patients or a rise in prescriptions per patient (e.g., prescriptions for the whole family or repeat treatments). We assume that the changes observed are more indicative of an increase in scabies than in other ectoparasitic infections, as the latter are much less common in Spain. This “large-scale national outbreak” has been attributed to COVID-19 lockdown measures and possible resistance to conventional treatments.14,15

Google searches for terms related to scabies have also shown a rising trend since 2004, with a notable increase observed since the end of 2012. Internet search volumes are a good indicator of public interest in a given topic, but they do not necessarily correlate with epidemiological phenomena. Many factors can drive public interest in a topic, including media coverage, commercial or advertising interests, novelty, and topics with a temporary or periodic nature.

Our data for Spain show that monthly ectoparasiticide sales were strongly and positively correlated with Google searches for scabies during the same period.

Sales and internet search volumes were also higher in winter than summer months, although the difference did not reach statistical significance. Infestations would be expected to be more prevalent in winter, as mites are able to survive for longer outside the host in humid, cold conditions.1,16

We observed a sharp drop in RSV following the peak in February 2022, but were unable to compare this to ectoparasiticide sales for the same period as the data had not been published at the time of writing. Perhaps the drop in search volume will ultimately be reflected in a drop in scabies cases, and with it, a drop in ectoparasiticide sales.

Conclusions

Public interest in scabies and ectoparasiticide sales in Spain have increased in recent years and show a strong, positive correlation. Despite its limitations, Google Trends could be considered as a complementary tool for monitoring real-time trends in scabies infestations in Spain.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

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